We use the perfective will have when we are looking back from a point in time when something will have happened.

By the end of the decade scientists will have discovered a cure for influenza.
I will phone at six o’clock. He will have got home by then.

or looking "back" from the present:

Look at the time. The match will have started.
It’s half past five. Dad will have finished work.

We use would have as the past tense form of will have:

I phoned at six o’clock. I knew he would have got home by then.
It was half past five. Dad would have finished work.

We use would have in past conditionals to talk about something that did not happen:

If it had been a little warmer we would have gone for a swim.
He would have been very angry if he had seen you.
 

Exercise

Section: 

Comments

People colloquially say, "The match would have started" instead of "will have". Is this acceptable in any way?

No. It's not reported speech like: he said that the match would have started

Thank you.

Could you please expedite the process of responding?
I would genuinely be thankful to you.
On 8th of September, I asked you a question concerning my grammatical dilemma. The question was.........
What are differences among the following sentences?

1. He can have caught the train.
2. He may have caught the train.
3. He will have caught the train.

Do all the above sentences have same sense?

Waiting for the response. Thank you.

Hello Arafat,

This is an example of a question that we are not likely to answer as described in the What are the comment sections for? on our Frequently asked questions page. This is because to answer it properly would take a significant amount of time on our part. Briefly I can say that the three sentences do not mean exactly the same thing - for the most part, what each modal verb can mean is explained on each of their pages.

Ours is a free service that generally responds within 24-48 hours, but for many reasons, including the one I mentioned above, we don't always respond that quickly. I'm sorry if this doesn't meet your requirements, but I'm afraid it's what we offer.

All the best,
Kirk
The LearnEnglish Team

Hi.
What are differences among the following sentences?

1. He can have caught the train.
2. He may have caught the train.
3. He will have caught the train.

Do all the above sentences have same sense?

Sir my doubt is passive voice can be used in future conditional sentence as well as future continuous conditional. Please give specific answers with example as it should help me lot. Thanks

Hello raji,

Yes, you can use the passive voice with verbs in the future conditional and future continuous. They're pretty unusual, however. If you want to submit a few sentences, we can tell you whether they're correct or not, though really if they are for homework, you should ask your teacher for help.

All the best,
Kirk
The LearnEnglish Team

Sir please explain whether passive voice could be used in future conditional sentences. And passive voice could be used in all conditional tenses such as conditional present, conditional continues and conditional past perfect tenses with few examples.

Hello raji,

Passive forms can be used in condition sentences without any problems:

If England defeat Iceland, I will buy you dinner!

If Iceland are defeated by England, dinner will be bought for you by me!

 

It does not matter which conditional form is used. Of course, whether or not the passive is good stylistically is another issue. In the example above, the passive in the first clause sounds fine, but in the second clause it is rather awkward.

 

Best wishes,

Peter

The LearnEnglish Team

Hello sir, I want to know about any subtle differences between Nevertheless and Nonetheless.

Hello Mani,

I'd recommend you check these words in a good dictionary, such as those from Cambridge and Oxford. Read all the entries and look at the example sentences. You might also find something useful by doing an internet search for 'difference between nevertheless and nonetheless'.

Good luck!

All the best,
Kirk
The LearnEnglish Team

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